Fluid goes through effector
The problem is that the collider's normals are inverted.
In solid view with the domain hidden, you can turn on the face orientation overlay to display the front of faces as blue and the back of faces as red.
As you can see, the collider's faces are facing inward:

To fix this problem, select the object enter edit mode, select everything, then press ShftN to recalculate the normals.
After doing this, the collider will work.

For the hallway object, be sure to tick the Is Planar radio button since the mesh is not closed.


To get the simulation fine enough to flow through the cracks, I set the domain resolution to 256.